Data Stream Authentication With Selective Supplemental Verification
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Solution Overview
Problem
Existing methods for authenticating complex data streams, such as video and audio streams, face challenges in verifying trustworthiness due to modifications or combinations of substreams, leading to complications in digital signature recalculation and potential tampering.
Innovation Solution
Incorporating an indication in the data stream to determine which supplemental information messages are to be considered for verification, allowing selective inclusion of these messages in the trustworthiness check, and using block-based predictive coding and transform-based residual coding for encoding and decoding to ensure reliable verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signatures are recalculated for modified or combined data streams, then authentication reliability is improved, but computational effort and processing time increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-calculating and embedding digital signatures in the original data stream before any modifications or combinations occur. This allows the signature to be prepared in advance, eliminating the need for recalculation when the data stream is later modified or combined with other streams, thus resolving the contradiction between authentication reliability and processing time.
Solution Approach 2:
The patent segments the authentication process by separating the signature calculation from the data stream modification process. The signature is calculated on the original unmodified data stream, while modifications and combinations can occur independently. This segmentation allows authentication to be performed without recalculating signatures, reducing computational effort while maintaining reliability.
2Measurement precision
If all supplemental information messages are included in verification, then measurement precision of authentication is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent extracts only the essential supplemental information messages that are necessary for authentication from the complete set of supplemental information messages. By selectively extracting and including only those messages that contribute to verification accuracy, the patent reduces the complexity of the verification process while maintaining authentication precision.
Solution Approach 2:
The patent applies local quality by differentiating between supplemental information messages based on their relevance to authentication. Instead of treating all supplemental messages uniformly, the patent identifies and includes only those with local quality characteristics that are essential for verification, thereby reducing overall system complexity while preserving authentication precision.
3Adaptability or versatility
If supplemental information messages are excluded from verification, then adaptability to complex streaming scenarios is improved, but reliability of authentication deteriorates
Solution Approach 1:
The patent applies dynamics by making the inclusion of supplemental information messages in verification adaptive rather than static. The system dynamically determines which supplemental messages to include based on the specific streaming scenario, allowing flexibility to adapt to different situations while maintaining authentication reliability through selective inclusion of relevant messages.
Solution Approach 2:
The patent changes the parameter of supplemental information message inclusion from a fixed state to a variable state. By adjusting which supplemental messages are included in verification based on the specific scenario parameters, the patent achieves both adaptability to complex streaming scenarios and maintained authentication reliability.
4Adaptability or versatility
If complex structures of data streams with multiple substreams are authenticated, then adaptability to real-world scenarios is improved, but difficulty of detecting and measuring tampering increases
Solution Approach 1:
The patent segments the complex data stream into its constituent substreams and applies segmentation to the authentication process. By calculating signatures on the original structure and maintaining separate tracking of substream modifications, the patent enables tampering detection in complex multi-substream scenarios without increasing overall detection difficulty.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of the pre-calculated digital signature that mediates between the complex data stream structure and the authentication process. This intermediary signature provides a reference point that simplifies tampering detection across complex multi-substream structures, reducing the difficulty of detecting modifications even as adaptability to complex scenarios increases.
Data Source
AI summary
Apparatuses and methods for checking a data stream on trustworthiness are described. According to an aspect, one or more supplemental information messages are considered in the trustworthiness of a data stream. According to another aspect, the data stream indicates, whether a segment is a first segment or whether a segment is a last segment of assigned sequence of segments. According to further segments, repetitions of certain supplemental information messages within certain portions of a data stream are either not included in the trustworthiness check, or are forbidden in the data stream.